Gas-pressure gage.



No. 886,552.y

PATENT@ MAYl; wo W..-THOMAS. GAS PRESSURE GAGE. APPLIUATION FILED APB. 11. 1907.

WITNESS/5S:

Naesaesz.

WALTER THOMAS, F VANCOUVER, BRITISH COLUMBIA, CANA-DA.

GAS-PRESSURE GAGE p Tonllwhom fit mcy-'concern' V A Be itfknown that I, VALTER THOMAS,a. cltizen of .the Dominion of (lanada, residing at Vancouver, in the Province of British.

Columbia, Canada, have invented a new and useful. Improvement in Gas-Pressure Gages,

yof. which the following is a specification.

This invention relates to a gas pressure indicating gage and is designed as yan improvement to a gage of that class known as Kings ressuregage wherein the gas, the pressure Vo which it is desired to ascertain, isv

admitted 'to an inclosed chamber partially A filled with water, mercury, or other suitable ferent parts of the same liquid into which dips 'the lower end ofia vertical tube open to the atmos here, so that the liquid in the vessel rises an falls in the vertical tube as the pressure within the inclosed chamber increases or lessens. The variation of the pressurefis indicated on a graduated scale by a pointer operated from a float on the li uid in the vertical tube.

In various in ustrie's it is lfrequently desirable to have under close observation the difference of pressure of gas or air in adjacent pipes or vessels and the present practice is to ascertain the pressure of-:each and subtract one from the other.

My invention is therefore directed to the provision of a com ound differential gage wherein two gages o the class described are ap lied together 'and their fioats'operate in icators or pointers and an annular dial" independently movable 4on a common axis and over a common dial so that the dierence of pressure in two pipes or vessels or in difpipe or vessel may be determined at a Glance.

The invention 1s fully -described in the following specification .and illustrated in the drawings by which it is accompanied, in which:

Figure 1 is a front elevation, and Fig. 2 a vertical section on theline 2-2 in Fig. 1.

In these drawings 2 represents an inclosed vessel which is divided into two separate compartments 3 and 4 by a vertical partition 5. These compartments are partially filled with water, mercury, or other suitable. li uid and into each com artment vertical tribes 7 roject through tiie cover 6of the vessel. he .lower end of` each .tube 7 eX- tends to within a short distance of the bottom and below the level of the liquid in the com artments and each upper end is. open tot e atmosphere. A gas connection, from l Specification of Lette-rs Patent.`

Application filed April L11, 1907.v Serial yI\To.367,56``l..

'the ioat of the back 'the manner shown by dotted lines `or both arbor`15 and sleeve 16 their 'Patented may 5,1968,

each Isourcethc pressures of whichit istiesired to compare,-is made -to ,eachzconrpartmen-t 3 ,and `fi li through the intervention of 'stopco'cks 8. Thus when the: gas-pressure is admitted to the compartments 3 y0.124 it will vact u 'on thesurfaceof the liquid in each and will orce itup the vertical tubes to a height above. 'the level fof theA liquid: in the compartment lcorresponding to the f pressure of the gas in each compartment.' l

In each vertical tube is-a float .10 which iioats are' connected' by flexible. cords' 11 to sheaves 12 and 13. The sheave 13 to which comp artment 4 is cbnnected is secured on alight shaft'oriarbor 1.5.l rotatable in a light lframe or casing lltin-l closing the mechanism and supportedat a convenient height above the vessel 2 which forms the base of the device, and the sheave l2 to which the flexible cord of the front compartment'S is connected is secured to a sleeve f 16 rotatable onvthe arbor 15.` y

' To the front end of the arbor 15, outside of the dial 17 which forms the front of the casa ing 14 is secured a pointer 18 which will thus indicate on the graduations of the dial 17 the elevation or depression of the lioat caused by fluctuations of the gas 'pressure in the baci lcompartment 4; and to the front end of the sleeve 16 to which the float of thev forward compartment is connected, is secured a pointer 19 and a dial ring 20 having graduations angularly corresponding to those of the fixed dial 17.. .This pointer 19 will therefore indicate onthe dial 1.7 the pressure in the front compartment Sand the difference between the angular 1positions of the two pointers .will indicate t e difference between the pressures in the compartments which d1iierence may be readoif onthe .dial ring'20,

which moves with the pointer 19. To facili-- tate adjustment of the pointers 18 and 19 theygare frictionally attached. tothe l'arbor and to the sleeve respectively.

In order to reduce iction the sleeve 16 instead of taking its bearing on the arbor 15 may be mounted on small roller bearings in in Fig. 1, may be so mounted, but this feature is not material to the invention which particularly relates to the application of the two, gages to indicate uctuations on a common dial :and to the dial lring on oneof the pointers whereby differences of pressure may be read o".

now4 particularly described my inl vention and the manner of its operation, I hereby declare that what I claim as new-and desire to be protected in by Letters-Patent is:

1. In a gas pressure gage of the `class described, a pair of adjacent'closed vessels, open ended tubes rojecting throuhthe top o each vessel an terminating a jacent to the bott'oln thereof, means for admitting gas said means to indicate the in ependent rise common scale the the float, a common dial co erating with and fall of thev floats, and a second dial coperat' with said indicating means to indicate ihe di erence between the rise and fall of .the

oats.

liioats tosaid pointers, and a dial ring secured to one of said pointers, t raduations to .'corre ate, substantially 3. In a gas pressure gage of tlie-class de-` scribed, adjacent closed Vessels, vertical tubes opened 'to the atmosphere projectin downward through the top of each 'Vesse said tubes terminating a short distance above` the bottom, means for admltting gas to within the vessels, a float in each Vertical tube, pointers coaxially supported and independently MmOVabIe', lmeans for connecting the said dial ring having spond with the dial p s own and. described.

name to two s ubscribingwitnesses.

WALTER THOMAS.

l Witnesses: l

RowLAND BBITTIN, CLIvE S. ABMAN.

In testimony whereof I have signed myy this specification in the presence ot l,

a graduated dial plate 

